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Title: Equilibrium and kinetic studies for Cd(II) adsorption from aqueous solution on <i style="">Terminalia catappa </i>Linn leaf powder biosorbent
Authors: Rao, K S
Keywords: <i style="">Terminalia catappa </i>Linn leaf<b> </b>powder
Issue Date: Sep-2010
Publisher: NISCAIR-CSIR, India
Abstract: <i style="">Terminalia catappa </i>Linn<i style="">,</i>(TCL)<b> </b>leaf (almond leaf) powder was tested as a biosorbent in a batch adsorption system. The samples with and without Cd(II) adsorption were characterized using FTIR and SEM-EPMA techniques. Loading of Cd(II) onto to TCL powder resulted in shift of various band positions (5 to 51 cm<sup>-1</sup>) in the FTIR spectrum. The EPMA of Cd(II) loaded powder showed that Cd(II) was not uniformly distributed on the surface but only on&nbsp; specific sites. The experimental parameters chosen for adsorption studies were: pH (2.0 to 6.0), contact time (5 to 120 min), adsorbate concentration (50 to 500 mg L<sup>-1</sup>), adsorbent concentration (0.25 to 5.0 g per 50 mL adsorbate), anions and Pb(II) concentration. With the increase in pH from 2.0 to 4.0, Cd(II) adsorption increased from 0.86 to 13.79 mg g<sup>-1</sup> and with the further increase in pH to 5.5 only marginal increase to 14.12 mg g<sup>-1</sup> was observed. Presence of chloride, sulphate or Pb(II) adversely affected Cd(II) adsorption onto TCL. The kinetics of adsorption could be best described by the pseudo-second-order equation. The three equilibrium models namely, Langmuir, Freundlich and Redlich-Peterson fitted well to the isothermic experimental data for TCL<i> </i>with regression coefficients of &gt; 0.97. The maximum uptake capacity of the biosorbent was estimated to be 35.83 mg g<sup>-1</sup>.
Description: 329-336
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.17(5) [September 2010]

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